That little fluff ball has it. Sheltie is the smartest dog I've ever been around. My little boy used to herd my mom around the house. I miss them both.
Car chasing is not good. Herding a person does not mean a dog will chase cars. This highly driven sheltie that herds cats, people, dogs and chickens, does not chase cars.
My nearly two-year old Sheltie tries to herd my adult Sheltie on to the doorstep so I have to take them out in my fenced-in yard separate to do their business or the adult never gets a chance to do hers. My pup also does the "sheep creep." She does a stealth walk towards the adult before she herds her on to the doorstep.
One of the first things we do is work puppies in the front yard. We live on a 40+mph road and staying in the yard, learning a recall is priority. Long lines are used for a LONG TIME.
How long would you use a long line for? My 17 month old sheltie is starting to get reactive again after doing so well with recall I think I need to put him back on a long line.